and Pecos Counties. This scenic loop includes the descent of Lancaster Hill, a crossing of the Pecos River at an old iron bridge, and passes through the small community of Sheffield before rejoining Interstate 10. In Sheffield on the northern side of the road near the Avenue E intersection, an old neon sign reads "OST Courts", although the Courts themselves are gone. New Mexico The OST continues primarily along the old grade of Historic US 80 in New Mexico from Anthony to Rodeo, leaving the state along New Mexico State Road 80. In 1924, the trail from Las Cruces went to Mesilla and then crossed the Rio Grande at the Mesilla Dam along County Road B006. That road once ran directly to Aden, New Mexico, and can still faintly be seen on aerial and satellite maps; it is no longer used or maintained. From Aden, the trail traveled northwest parallel to the Southern Pacific Railroad through Cambray and then approximately followed what is today New Mexico State Road 549 to Deming. Arizona The OST crosses the state mostly along historic portions of old US 80 signed Arizona State Route 80, entering Arizona southwest of Rodeo and exiting the state by crossing the Colorado River north of Yuma. One exception to the US-80 route is at Ligurta, where the OST followed the Butterfield Stage Route up to Dome, then South down US-95 to reconnect with the US-80 route. California Driving West, the old road continues to follow US 80 to Boulevard and then diverts onto Campo Road, cosigned California State Route 94. In Spring Valley, the trail diverges from 94 and continues along Campo Road to Lemon Grove, where it turns left and travels down Lemon Grove Avenue, which becomes Imperial Avenue into San Diego. By 1931 the Old Spanish Trail had been re-routed to travel along US 80, west of Boulevard, paralleling I-8 as Old Highway 80, which becomes El Cajon Blvd further west. In San Diego, the trail turns left at Park Blvd and heads downtown. The Western terminus of the Old Spanish Trail can be found at Horton Plaza in San Diego on Broadway and 4th. Here, the Pacific Milestone marks the end of the trail. It reads, "Pacific Milestone dedicated by our beloved President Calvin Coolidge Nov 17, 1923". References External links Old Spanish Trail centennial website History of the Old Spanish Trail The Old Spanish Trail